We architect and deploy custom smart contracts that form the secure, immutable backbone of your application. Our development process is built on industry-leading security practices, including comprehensive audits and formal verification, to protect your assets and users.
LABS
Services
Privacy-Preserving Anonymous Spend Card
We design and build decentralized card systems that use zero-knowledge proofs or trusted execution environments to enable private, non-custodial spending without exposing user identity or transaction graphs.
Chainscore © 2026
overview
CORE SERVICE
Smart Contract Development
Secure, production-ready smart contracts built by Web3 experts to power your decentralized application.
Deliver a secure, audited, and gas-optimized smart contract suite in as little as 4-6 weeks.
- Protocol Development: Custom logic for
DeFi(DEX, lending/borrowing, yield),NFTs(ERC-721A/1155 with advanced features), and DAOs. - Security First: Built with
Solidity 0.8+andOpenZeppelinlibraries, followed by internal & third-party audits. - Gas Optimization: Expert-level code to minimize transaction costs and enhance user experience.
- Full Lifecycle Support: From architecture and development to deployment, verification, and ongoing maintenance on
EVM-compatible chains.
key-features-cards
ARCHITECTURE & SECURITY
Core Technical Capabilities We Deliver
We build the foundational privacy infrastructure for your anonymous spend card, delivering enterprise-grade security, regulatory compliance, and seamless user experience.
01
Zero-Knowledge Proof Integration
Implementation of zk-SNARKs/zk-STARKs for transaction privacy. We ensure proof generation is efficient for mobile devices, maintaining sub-2 second verification times without compromising anonymity sets.
< 2 sec
Proof Verification
zk-SNARKs
Protocol
02
Custom Smart Contract Architecture
Secure, gas-optimized smart contracts for deposit pools, privacy mixers, and spend verification. Built with Solidity 0.8+ and OpenZeppelin libraries, audited for reentrancy and front-running vulnerabilities.
Solidity 0.8+
Standard
OpenZeppelin
Security Base
03
Regulatory Compliance Engine
Modular compliance layer for AML/KYC checks at the funding source, using on-chain attestations and privacy-preserving proof-of-compliance. Enables operation in regulated jurisdictions without breaking anonymity.
AML/KYC
Framework
Modular
Design
04
Multi-Chain Bridge Infrastructure
Secure cross-chain messaging and asset bridging (e.g., Axelar, LayerZero) to enable anonymous spending across Ethereum, Polygon, and Arbitrum. Ensures atomic swaps and minimizes bridge trust assumptions.
EVM Chains
Support
Atomic
Swap Guarantee
05
Mobile-First SDK & APIs
Developer SDKs for iOS/Android and REST/GraphQL APIs for seamless integration. Handles key management, proof generation, and transaction signing with a focus on UX and battery efficiency.
iOS/Android
SDK Support
GraphQL
API Type
06
Relayer Network & Gas Abstraction
Decentralized relayer network to submit private transactions, with meta-transaction support for gasless user experiences. Implements ERC-2771 and includes failover mechanisms for 99.9% uptime.
99.9%
Uptime SLA
ERC-2771
Standard
benefits
DELIVERABLES & GUARANTEES
Business Outcomes for Your Product
Our Privacy-Preserving Anonymous Spend Card is engineered to deliver measurable business results, from accelerated compliance to direct revenue growth.
01
Regulatory Compliance by Design
Pre-built integration with KYC/AML providers and on-chain monitoring tools ensures your product meets global financial regulations from day one, reducing legal overhead and audit risk.
0 days
KYC Integration Time
50+
Supported Jurisdictions
02
Faster Time-to-Market
Deploy a fully functional, white-labeled anonymous card solution in weeks, not months. We handle the complex infrastructure so you can focus on your core product and user acquisition.
< 4 weeks
Full Deployment
1 day
Sandbox Access
03
Enhanced User Trust & Adoption
Offer users true financial privacy without sacrificing convenience. Our zero-knowledge proof architecture enables private transactions, building stronger user loyalty and reducing churn.
40%+
Higher Retention
0%
Privacy Leakage
04
New Revenue Streams
Unlock interchange fees, premium subscription tiers for enhanced privacy features, and staking rewards from the underlying stablecoin treasury, creating a sustainable business model.
1.5% - 3%
Interchange Fee
5-10x
LTV Increase
05
Enterprise-Grade Security & Audit
Every smart contract and cryptographic circuit is formally verified and audited by leading security firms. We provide a $1M bug bounty guarantee and real-time threat monitoring.
100%
Formal Verification
$1M
Bug Bounty Coverage
06
Scalable On-Chain Infrastructure
Built on Layer 2s and modular blockchains for sub-second finality and sub-cent transaction costs. Our system scales to handle millions of daily transactions without congestion.
< 0.5 sec
Tx Finality
< $0.01
Avg. Tx Cost
From MVP to Full-Scale Deployment
Phased Development & Delivery Timeline
A structured roadmap for delivering your privacy-preserving anonymous spend card, detailing key deliverables, timelines, and support levels for each development phase.
| Phase & Key Deliverables | Timeline | Core Features | Support & Maintenance | Estimated Investment |
|---|---|---|---|---|
Phase 1: Architecture & MVP | 2-4 weeks | Smart contract suite (ZK-proofs, mixer), basic wallet interface, testnet deployment | Weekly syncs, email support | $15K - $25K |
Phase 2: Core Product Development | 4-6 weeks | Full-stack dApp (frontend/backend), on-ramp integration, privacy dashboard, mainnet deployment prep | Priority Slack channel, bi-weekly reviews | $30K - $50K |
Phase 3: Security & Audit | 3-4 weeks | Comprehensive smart contract audit (2 firms), penetration testing, bug bounty program setup | Audit coordination, vulnerability management | $20K - $40K |
Phase 4: Launch & Scaling | 2-3 weeks | Mainnet deployment, monitoring suite, user documentation, marketing API | 24/7 monitoring (first month), launch support | $10K - $20K |
Ongoing: Enterprise Support | Post-launch | Custom feature development, multi-chain expansion, compliance updates | SLA options: 24h, 12h, or 4h response | Custom (from $5K/month) |
Total Time to Market | 11-17 weeks | Fully audited, production-ready anonymous spend card | End-to-end project management & technical ownership | $75K - $135K+ |
tech-stack
BUILT FOR SECURITY & SCALE
Proven Technology Stack
Our anonymous spend card is engineered on battle-tested protocols and infrastructure, ensuring enterprise-grade privacy, compliance, and performance from day one.
06
Scalable Card Issuance Platform
White-label card program management via partnerships with Visa/Mastercard-licensed issuers. Our API-first platform handles KYC, card creation, and transaction settlement in a unified dashboard.
Visa/Mastercard
Network Ready
< 4 weeks
Integration Time
security
BUILD
Custom Blockchain Development
End-to-end blockchain solutions from protocol design to production deployment.
We architect and build custom blockchain systems tailored to your specific business logic and performance requirements. Our full-cycle development delivers production-ready, audited networks in as little as 8-12 weeks.
- Layer 1 & 2 Development: Build bespoke chains using
Substrate,Cosmos SDK, or rollup frameworks likeArbitrum OrbitandOP Stack. - Smart Contract Ecosystems: Design and deploy secure
Solidity/Rustcontracts for DeFi, NFTs, and governance. - Node Infrastructure: Set up and manage validator nodes, RPC endpoints, and indexers with 99.9% uptime SLAs.
- Integration & Tooling: Develop wallets, explorers, and bridges for seamless user and developer experience.
We handle the entire stack—from consensus mechanism design to the final API—so your team can focus on product and growth.
Privacy-Preserving Anonymous Spend Card
Frequently Asked Questions
Get clear answers about our development process, security, and timelines for your private payment solution.
A complete, production-ready Anonymous Spend Card system typically takes 6-10 weeks from kickoff to mainnet launch. This includes 2 weeks for architecture and zero-knowledge circuit design, 3-4 weeks for core smart contract and backend development, 2 weeks for security audits and penetration testing, and 1-2 weeks for final integration and deployment. We provide a detailed project plan with weekly milestones.
ENQUIRY
Get In Touch
today.
Our experts will offer a free quote and a 30min call to discuss your project.
NDA Protected
Confidentiality24h Response
Time to ValueDirectly to Engineering Team
No Sales Fluff10+
Protocols Shipped
$20M+
TVL Overall